Machine for making pipes.



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. J. FRASER.

MACHINE FOR MAKING PIPES.

APPLICATION FILED NOV. 8, 1909.

1,037,888, Patented Sept, 10,1912.

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MACHINE FOR MAKING rrrns.

Specification of Letters Patent.

Patented Sept. 10, 1912.

I Application filed November 8, 1909: Serial No. 526,854. a

To all whom it may concern;

Be it known that I, JOHN FRASER, a citizen of the United States ofAmerica, re-

siding in Hackensack, in the county of Bergen, in the State of NewJersey, have invented a certain new and useful Improved Machine forMaking Pipes, of which the following is a specification.

My invention rel tes' to apparatus for producing sheet metal pipes bysqueezing lock-bars on the longitudinalupset edges of metallic plates,which have been previously bent to shape. A machine for producing.

sheet metal pipes of this character with their longitudinal jointssecured by lockbars instead of rivets, is disclosed in the Patent No.914,369, ranted to myself and Thomas Gray, Marc lock-bars were squeezeddown onto the upset edges of the bent metal plates by means ofreciprocating pressing tools, squeezing down a short length of thelock-bar at each operation. While that mode of operation is commerciallyracticable, it is somewhat slow and it res ts in a product not alwayssatisfactory. The underlying reason for the unsatisfactoriness of theproduct is that the slowness of the process necessitates the working ofthe bars cold, and consequently onl a soft steel of limited range andquite di erent from the metal of the sheets can be used for thelock-bars and in the finished joints the metal of the bars is'left in astate of strain and stress not conducive to the best conditions for aperfect joint.

It is the object of my present invention to construct a machine whichwill quicken the operation and therefore 'render it more economical andwhich will also permit of the working of the lock-bars hot, so as toallow of the use. of a wide range of metal, including metal ofsubstantially the same character as that of the sheets and therebyobtain pipes with more perfect joints. This object I attain byconstructing the apparatus as hereinafter described.

In the drawings, Figure 1 is a plan View of my improved lock-bar rollingapparatus,

' one half of the guide frame being omitted;

Fig. 2 is a corresponding elevation, withthe ri ht half in section onthe line 22, Fig. 1.

11 carrying out my invention I provide a pit A as deep as the longestsection of pipe to be made, and on foundations at the mouth of the pit Imount a horizontal frame carrying the tools to operate on the lock-bars.

2, 1909. In that the Owing to the limits of the drawing sheet, the pit Ais shown therein very much shortened. In the bottom of the pit issecured a flanged foot piece F supporting the vertical mandrel in theform of a pipe E, which carries at the top, in line with thelongitudinal frame, a head G having grooved rolls H, H to coiiperatewith grooved rolls H H on the frame to roll down the lock bars ;0 39onto the upset edges of the bent plates l P. a j

The machine shown in the drawing is constructed to operate on twodiametrically opposite lock-bars simultaneously, but of course themachine may be constructed to work on one lock-bar or on more than two,as the diameter of the pipe to be produced or other conditions mayrequire. The rolls on the head'Gare mounted to turn in bearings inbrackets g, and the rolls on the frame are mounted to turn in bearingsm. I prefer to provide two pairs of rolls H, H and H1, H one pairvertically over the other, for each lock-bar, and to make the spacing ofthe grooves in the upper pair of rolls a little farther apart than thosein the lower pair so that as the pipe is fed downwardly in'to'the pit,the upper pair of rolls will only need to do part of the squeezing ofthe lock-bars, the lower rolls completing the operation.

The horizontal frame which carries the outer sets of rolls H, H may beof any con-- venient construction. I have shown it as composed of fixedcross-heads B, B, connected by horizontal bars C, C, the whole suit--ably mounted on foundations at the mouth of the pit." Instead ofmounting the outer rolls H H directly on the cross-heads B, B, I mountthem on inner cross-heads D, D, which can be adjusted toward or from thecentral head G upon the bars C, C, and.

maintained in their adjusted positions by the introduction of fillingpieces J of the thickness required for the purpose.

I provide means for positively driving the outer sets of rolls H H.Convenient for this purpose is the mechanism and gearing shown. in thedrawing, and comprising a motor U (Fig. 1) driving a horizontal shaftRthrough pinionWand gear V. This shaft is mounted on bearings S on apedestal T (Fig. 2). The outer ends of the shaft pass through and haveslidlng key and keyway connections with bevel pinions N, N, which turnin bearings O, O, in the inner adjustable cross-heads'D, D. When theseinner cross-heads are adjusted, the. pinions N, N slide longitudinallyon the keyed parts of the shaft R. The pinions N, N mesh with bevelgears L, L, on short horizontal shafts M, M mounted in suitable=bracketsm m in the adjustable cross-heads D, D. These shafts M, M impart rotarymotion to their respective rolls H H through the medium of the gears K,K, K.

I prefer to combine with the described construction of rollingmechanism, a pipe guiding frame X, which may be similar to that shown in'the'patent above referred to, and mounted upon the connecting bars 0 ofthe horizontal frameat the mouth of the pit. This frame, only half ofwhich is shown in the drawings, has suitably-located guiding rollers Yfor the curved sheets to form the pipe.

The operation of the apparatus will be readilyhnderstood from theforegoing explanation, and from that it will be seen that the sheets andlock-bars can be fed downwardly through the squeezing rolls withsuficient speed to permit the lock-bars to be thus squeezed onto theupset edges of thebent sheets, while the lock-bars are hot, all withtheadvantages hereinbefore explained.

I claim as my invention- 1. Ali'apparatus forclosing longitudinallock-bar pipe joints, comprising a vertical mandrel with rolls for theinner faces of the lock hars in combination with a horizontal frame,adjustable cross-heads on the latter carrying rolls for the outer facesof the locilks-bars, and means for driving said outer ro v 2, Apparatusfor closing longitudinal lock-bar pipe joints, comprising a verticalmandrel with inner rolls, and a horizontal frame with cooperating outerrolls, the

rolls'being in successive pairs differently spaced to com lete' therolling down of the lock-bars on t e edges of the plates by successive oerations, as and for the purpose described In testimony wherof I havesigned my name to this specification, in the presence of two subscribingwitnesses.

' JOHN FRASER. Witnesses:

WALTER ABBE, HUBERT Howson.

